System of fuel and water supply for boilers.



H. LEMP. SYSTEM OI FUEL AND WATER SUPPLY FOR BOILERS.

. APPLIGATION FILED AUG. 7,,1907. RENEWED 0OT.11, 1910. 3* i F-@ 9 Patented June '13, 1911.

fa n/ant or;

UNITED STATES PATENT OFFICE.

HERMANN LEMP, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC- I COMPANY, A CORPORATION OF NEW YORK.

SYSTEM OF FUEL AND WATER SUPPLY FOR BOILERS.

Specification of Letters Patent. Patented June 13, 1911,

Application filed August 7, 1907, Serial No. 387,432. Renewed October 11, 1910. Serial No. 586,557.

To all whom it may concern: Be'it known that I, I-IERMANN LEMP, a citizen of the United States, residing at Lynn, county of Essex, State of Massachu setts, have invented certain new and useful Improvements in Systems of Fuel and lVa ter Supply for Boilers, of which the. follow- .ing is a specification.

This invention relates to that class of steam generators known as semi-flash boilers, and its object is to regulate automatr= callythe supply of fuel and water in order that the steam pressure may be kept at or near a constantvalue. The fuel used is ordinarily a liquid hydrocarbon, and this and the'feed water are usually supplied to the burnerandthe boiler respectively by means "of pumps. Sometimes pneumatic pressure issubstituted for .the pump to force the liquid fuel from its reservoir to the burner. It: is necessary to regulate very carefullythe quantities of fuel and water in order that the boiler may at all times meet the varying demand for steam and maintain a pressure which departs as little as possible from a predetermined normal value. It has been heretofore proposed to accomplish this result automatically in a variety of ways, some ot'iiwhich depend upon the pressure of theysteam and some upon its temperature.

Inthdpresent application I'make use of .eboth-of these agencies, as will hereinafter appear. Briefly, stated, the water feeds by gravity to a pump which forces it into the boiler: The fuel is fed by gravity to the burners, but an additional supply undera 7 pressure is provided by a pump. Both pumps are steam-actuated, pref rably by a sin 'le cylinder, and the supply of steam to sai cylinder is governed by two pressure regulators, one responsive to the pressure of the steam and the other to the pressure of the fuel. The fuel supply is governed by a pressure regulator. responsive to pneumatic '45 pressure, and said pressure is controlled by perature'of the steam The accompanying drawing is a diagram of parts and cohnections illustrating my a theri'nostatic valve responsive to the temsystem.

The boiler-is eom'entionally represented as a zigzag COll of pipe-1 mclosed in a casing 2 lined with heat-resisting material. The

casing extends bclow the coil to form a fire 65 chamber in which are burners 3 of any approved design capable of vaporizing and burning liquid fuel. The pump for supplying fuel and water to this boiler is preferably one in which the steam cylinder 4, water cylinder 5 and oil cylinder 6 are arranged in tandem, with a common piston rod 7. Water is taken from a tank 8, feed- I ing preferably by gravity to the pump 5,

which delivers it through a pipe 9 to the upper" end of the boiler. Steam isjtaken from the lower end of the boiler by a main 10 to the engine or other device for utilizing it. A branch main 11 supplies steam to the pump-cylinder 4. Two pressure regulators 12 13, of any approved design, are interolated in this branch steam main, in series, ocatedbetween the cylinder 4 and the throttle valve 14. The regulator 12 is controlled b 1 the pressure of the steam in the main be ore it reaches the throttle, connection being made by means of a small pipe 15. Thepressure in the main is shown-by a gage l6. i

' Liquid fuel is contained in a reservoir 17 from which it can flow by gravity through a pipe 18 to the burners 3L A branch pipe 19 feeds fuel to the oil-pump G which delivers it into the pipe 18 under considerable pressure which is indicated by agage 20. A check valve 21 prevents the oil from returnin to the reservoir. The pipe 18 connects a so with the steam regulator 13. lhe flow of oil is automatically regulated by a pressure regulator-22, whose movable abutment 23 is responsive to the pressure ofelastic fluid in a pipe 24 leading from a suitable source of supply. If compressed airis used, it is confined in a drum 25, and its admission to the regulator 22 is controlled by a thermostat responsive to the temperature of the steam in the main 10. In the drawing, the thermostat consists of a loop 26 of the main itself which is connected by a cord or rod 30, attached to an abutment- 31 whichis exposed to the .oil pressure. An adjustable spring 32 holds the valve closed againstthe normal pressure of the oil, but permits it to open when that pressure is exceeded.

der pressure to said burner, means for consive to rise in boiler pressure and the otherlate the speed of the pump to correspond the burners can take care of, the increased pressure will operate the regulator 13 to stop Wlt-ll the apparatus which I now consider other means.

. der pressure to said burner, two'pressure The steam cylinder is so proportioned that it will pump water against a back-pressure in the boiler, preferably one which is twice that of the steam pressure. The water and oil pumps are so proportioned that their de- I liveries are in a fixed ratio of abouttwelve to one by Weight. This gives a trifle more than the correct proportlon. of oil.

The throttle Will be so adjusted as to reguwith the normal working conditions. If then the steam main 10 should be closed, the rise in steam pressure in the boiler will operate theregulator 12 and shut down the pump, thereby stopping the water and oil supply. When the pressure falls again, 0wing either to the stopping of the oil feed, or to reopening of the steam main 10, the regulator 12 will start the pump again. If the oil pressure should be greater than the pump until said pressure falls to normal. 'F or instance, if the water supply should fail, the pump would speed up, but

it. In case the boiler becomes. over-heated, superheating the steam to a dangerous degree, the thermostat admits air pressure to the regulator 22 which shuts off the forced flowof oil to the burners and thereby reduces the fire, the oil meanwhile returning to the reservoir through the bypass.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by What I claim as new and desire to secure by Letters Patent of the United States, is;-

"1. The combination with a boiler, of a burner therefor, a steam pump for supplying water to said boiler and liquid fuel untrolling said pump by an abnormal riseeither in steam pressure or fuel pressure, means responsive to an abnormal rise in temperature of the steam for controlling the flow of fuel to the burner, and a by-pass for the fuel portion of the pump which becomes operative under certain fuel pressure conditions.

The combination with a boiler, of a burner therefor, a steam pump for su plying water to said boiler and liquid fue unregulators independently .controlliug the supply of steam to said pump, one, responresponsive to rise in fuel pressure, a thermostat responslve to changesin tempera- 3. The combination with a boiler, of a, burner therefor, a steam pump adapted to supply proper proportions of water and liquid fuel, means for governing said pump by boiler pressure and fuel pressure, means for controlling the supply of fuel by the temperature of the steam, and a by-pass forthe fuel portion of the pump which becomes operative under certain fuel pressure conditions.

4. The combination burner therefor, a steam pump adapted to supply proper proportions of water and liquid fuel, means for automatically governing said pump, a thermostat responsive to changes in the temperature of the steam and controlling the flow of fuel to the burner, and a by-pass for thefuel end of the pump which becomes operative under certain conditions of fuel 'pressure.

5. The combination with burner therefor, a steam pump adapted to supply proper proportions of water and liquid fuel, means ing said pump, a pressure regulator. controlling the flow of liquid fuel, a source of elastic fluid pressure, and a thermostat responsive to changes in the temperature of the steam and controlling the admission of elastic fluid pressure to said regulaton' The combination with a boiler, of a burner therefor, a steam pump adapted to supply proper proportionsof water and liquid fuel, a thermostat responsive to changes in the temperature of the steam and controlling the flow of fuel, a by-pass for the fuel end of the pump which becomes operative when the supply of fuel to the burner is interrupted by the act-ion of the thermostat, and a pressure regulator responsive to changes of pressure of said fuel and controlling the supply of steam to said pump.

7. The combination with a boiler, of a burner therefor, a steam pump adapted to for automatically govern-' with a boiler, of a v a boiler, of a I supply proper proportions of water and liq uid fuel, a pressure regulator for controlling the flow of fuel, a source of air under pressure, a thermostat responsive to changes in the temperature of the steam which controls the admission of 'air pressure 'to the regulator, and steam pressure and fuelpressure deyices controlling said pump.

8. The combination with burner for heating the boiler, a steam pump for supplying water to the boiler and liquid fuel under pressure to the burner, means for governing the pump by boiler pressure and by fuel pressure, a pressure regulator for controlling the flow of fuel to the burner, a

a boiler, of a i F 1 1 l eee'eeo e source of air under ressure, and a thermostat responsive to eianges in the temperature of the steam which centrols the admission of air under pressure to said. re uieter.

and fuel in suitable proportions to the boiler and burner,-a. sourceof elastic fluid under pressure, a pressure actuated regulator for controlling the supply of fuel to the burner, and a thermostatresponsive to changes in the temperature of the steam for eentrel ling the admission of fluid from said source to said regulator? 10. In a system of fuel end Water supply fora. boiler, a source of elastic fluid under pressure, means for controlling the supply of fuel by the temperature of the steam, said means including a device which is actuated by the pressure fluichund means for controlling both the :fuel and Water by the pressure of the steam.

The ccunhumtien with boiler heatecl ,hy quill fuel, of :1 steam main leading 9, The combination with a boiler, of burner therefor, means for supplying Water,

ther "rem, a i 1 pump fe pplying the lmiler with liquid, sui l pump eeiug connected with the stem-n main, a pressure actuated regulator for controlling the supply otfuel t0 the boiler, a source of elastic fluid under pressure, and s thermostatfor controlling the applicuthm of said pressure fluid to the re -Meter con'nprisiug ion of the steam main between the boiler end the pump.

In witness where-0f, I have hereunto set my hand this second. day of August, 1907.

l-IERMAN N LEMP.

l-Vitnesses:

JOHN A. ilIOIVlANUS, Jr.,

O. WnsTENuAne. 

